JP2013000698A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system that can suppress excessive supply of a chemical agent.SOLUTION: The water treatment system includes: a cooling tower 110; a circulating water line L110; a quantitative discharge pump means 152 that supplies the chemical agent to the circulating water line L110; a chemical agent amount detecting means 134 that detects the dissolved chemical agent amount in circulating water W110; and a chemical agent supply control means 101 that executes (i) a process of setting the number of discharge times of the quantitative discharge pump means 152 to the maximum number Smax of discharge times when the dissolved chemical agent amount in the circulating water W110 is less than a first dissolved chemical agent amount C1, (ii) a process of setting the number of discharge times of the quantitative discharge pump means 152 to a value smaller than the maximum number Smax of discharge times but larger than the minimum number Smin of discharge times when the dissolved chemical agent amount in the circulating water W110 is equal to or larger than the first dissolved chemical agent amount C1 but less than a second dissolved chemical agent amount C2, and (iii) a process of stopping the supply of the chemical agent by the quantitative discharge pump means 152 when the dissolved chemical agent amount in the circulating water W110 is equal to or larger than the second dissolved chemical agent amount C2.

Description

  The present invention relates to a water treatment system that circulates circulating water between a cooling tower and a device to be cooled.

  In commercial buildings, industrial plants, etc., cooling water is used to cool a device to be cooled (cooling load device) such as a heat exchanger incorporated in an air conditioner or a refrigerator. From the viewpoint of saving the cooling water, the cooling water is circulated and used while being cooled in the cooling tower (hereinafter, the circulating cooling water is appropriately referred to as “circulated water”). The circulating water circulates between the cooling tower and the apparatus to be cooled through the circulating water line (the circulating water supply line and the circulating water recovery line).

  In the water treatment system, when the circulating water is continuously circulated, the quality of the circulating water gradually deteriorates and various water troubles that reduce the cooling capacity occur. Therefore, in order to improve the quality of the circulating water, chemicals such as slime control agents, anticorrosive agents, scale inhibitors, etc. are mainly supplied to the circulating water line (hereinafter also referred to as “medicine injection” where appropriate). ing.

  As a method of supplying a medicine to the circulating water line, a so-called timer medicine injection system is known in which the supply and stop of the medicine are alternately repeated every predetermined time. Further, a method is known in which the ORP (oxidation-reduction potential) value of circulating water flowing through the circulating water line is measured with a sensor, and the supply amount of a chemical comprising an oxidation-type slime control agent is automatically adjusted. In this method, the supply of the medicine is started when the ORP value of the circulating water reaches the medicine start water quality, and then the medicine supply is stopped when the ORP value of the circulating water reaches the medicine stop water quality. Yes (see Patent Document 1).

JP 2002-240883 A

  In the above-described timer drug injection method, it is necessary to supply an excessive amount of drug in order to ensure a drug concentration above a certain level, which increases the economic burden on the user. On the other hand, in the method of automatically adjusting the supply amount of the medicine according to the ORP value of the circulating water, it is possible to suppress excessive supply of the medicine as compared with the timer medicine injection method. However, since the route of the circulating water line is generally long, even if a medicine is supplied to a part of the route, it is not immediately reflected in the ORP value. For this reason, if the medicine is continuously supplied until the ORP value is equal to or higher than the predetermined value, the medicine may be excessively supplied as a result.

  Therefore, an object of this invention is to provide the water treatment system which can suppress the excessive supply of a chemical | medical agent.

  The present invention includes a cooling tower for cooling the circulating water supplied to the apparatus to be cooled, a circulating water line for circulating the circulating water between the cooling tower and the apparatus to be cooled, and a medicine per unit time set. A fixed amount discharge pump means for supplying to the circulating water line based on the number of times of discharge; a drug amount detecting means for detecting an amount of a drug contained in the circulating water flowing through the circulating water line as a dissolved drug amount; When the amount of the dissolved drug detected by the drug amount detection means falls below the first dissolved drug amount that is the lower limit threshold value of the dissolved drug amount that increases the number of times of discharge of the drug per unit time, supply from the metered discharge pump means A process of setting the number of discharges per unit time of the drug to be discharged to the maximum number of discharges and supplying the drug from the metered discharge pump means to the circulating water line by the set number of discharges, (ii) When the amount of the dissolved drug detected by the amount detection means exceeds the first dissolved drug amount and falls below the second dissolved drug amount which is the upper limit threshold of the dissolved drug amount that reduces the number of times the drug is discharged per unit time, The number of discharges per unit time of the medicine supplied from the constant discharge pump means is set to a number smaller than the maximum discharge number and larger than the minimum discharge number, and the circulation from the constant discharge pump means by the set discharge number A process of supplying a medicine to the water line, and (iii) a process of stopping the supply of the medicine by the quantitative discharge pump means when the amount of the dissolved medicine detected by the medicine amount detection means exceeds the second dissolved medicine amount And a chemical supply control means for executing the above.

  Further, in the water treatment system, the drug supply control means, when the amount of dissolved drug detected by the drug amount detection means exceeds a substantially intermediate value between the first dissolved drug amount and the second dissolved drug amount, The number of discharges per unit time of the medicine supplied from the constant discharge pump means is set to a number approximately halfway between the maximum discharge number and the minimum discharge number, and the circulation from the constant discharge pump means by the set discharge number It is preferable to supply the drug to the water line.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system which can suppress the excessive supply of a chemical | medical agent can be provided. As a result, the drug concentration in the circulating water can be maintained within an appropriate range.

It is a schematic block diagram which shows the water treatment system of embodiment. It is a functional block diagram concerning control of water treatment system 100 of an embodiment. 7 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 controls the supply of a medicine from the medicine supply device 150 to the circulating water line L110. It is a flowchart which shows the whole process sequence in case the control part 102 of the water treatment system 100 performs a blow process. It is a flowchart which shows the process sequence in case the control part 102 of the water treatment system 100 performs a 1st blow process. It is a flowchart which shows the process sequence in case the control part 102 of the water treatment system 100 performs a 2nd blow process.

  Hereinafter, a schematic configuration of a water treatment system 100 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a water treatment system 100 of the present embodiment.

  As shown in FIG. 1, the water treatment system 100 of this embodiment circulates circulating water W110 (cooling water) in order to cool a cooled device 131 such as a heat exchanger incorporated in an air conditioner or a refrigerator. It is a system to let you. The circulating water W110 is circulated and used while being cooled by the cooling tower 110 from the viewpoint of saving. The cooling tower 110 in this embodiment is a so-called open type cooling tower.

  The water treatment system 100 of the present embodiment includes, as main components, a cooling tower 110, a cooled device 131, an electrical conductivity measuring device 133, a residual chlorine measuring device 134 as a chemical amount detecting means, and a chemical supplying device. 150 and the system control apparatus 101. The water treatment system 100 includes a circulating water line L110 and a makeup water line L120. The “line” is a general term for a line capable of fluid flow such as a flow path, a path, and a pipeline. Moreover, in FIG. 1, the path | route of electrical connection is shown with the broken line.

  The cooling tower 110 is a facility for cooling the circulating water W110 for cooling the apparatus to be cooled 131. The cooling tower 110 includes a tower main body 111, a water sprinkling unit 112, a storage unit 116, a louver 118, a fan 120, an upper opening 121, and a fan driving unit 122.

  The tower main body 111 is a housing that forms an outer shell of the cooling tower 110. A plurality of sprinklers 112, a fan 120, an upper opening 121, and a fan drive unit 122 are provided on the top of the tower body 111. A storage part 116 is provided in the lower part of the tower body 111. A louver 118 is provided on the side of the tower body 111.

  The water sprinkling unit 112 is a part that sprays the circulating water W110 in order to cool the circulating water W110 that cools the apparatus to be cooled 131. The sprinkling unit 112 sprays (sprinkles) the circulating water W110 recovered from the cooled device 131 through the circulating water recovery line L112 (described later) into the tower main body 111.

  The watering part 112 includes an upper water tank 113 and a watering port 114. A circulating water recovery line L112 (circulating water line L110) is connected to the upper water tank 113. The upper water tank 113 stores the circulating water W110 recovered from the cooled device 131 via the circulating water recovery line L112. The water spout 114 is composed of a nozzle formed on the lower side of the upper water tank 113 in order to spray the circulating water W110 stored in the upper water tank 113.

  The storage part 116 is a site | part which stores the circulating water W110 sprayed from the water sprinkling part 112. FIG. The storage part 116 is provided in the lower part of the tower main body 111. The circulating water W110 sprayed downward from the sprinkler 112 is cooled by exchanging heat with the outside air E1 (described later) having a low temperature in the process of falling inside the tower body 111. A circulating water supply line L111 (described later) of the circulating water line L110 is connected to the bottom of the storage unit 116. The circulating water W110 stored in the storage unit 116 is supplied to the cooled apparatus 131 via the circulating water supply line L111.

  The louver 118 is a vent hole for introducing outside air (air) E1 into the tower main body 111. Outside air E1 outside the tower body 111 is introduced into the tower body 111 via the louver 118.

  The upper opening 121 is an opening formed in the upper part of the tower main body 111. The upper opening 121 discharges the outside air E <b> 1 located inside the tower main body 111 to the outside of the tower main body 111. The air discharged from the upper opening 121 is also referred to as “exhaust E2”.

  The fan 120 is disposed in the upper opening 121. The fan 120 is connected to a rotation shaft (reference number omitted) of the fan driving unit 122. The fan 120 generates a negative pressure inside by rotating, and introduces the outside air E1 from the louver 118 to the inside of the tower main body 111, and the outside air E1 introduced into the inside of the tower main body 111 through the upper opening 121. To the outside of the tower body 111.

  The fan drive unit 122 is a drive source that rotates the fan 120. The fan drive unit 122 is configured by a motor (not shown). The fan drive unit 122 is disposed above the fan 120. The fan driving unit 122 is electrically connected to the system control device 101. Operation (drive and stop) of the fan drive unit 122, adjustment of the rotation speed (shift), and the like are controlled by a drive signal from the system control device 101.

  The circulating water line L110 is a line for circulating the circulating water W110 between the cooling tower 110 and the apparatus to be cooled 131. The circulating water line L110 includes a circulating water supply line L111 that supplies the circulating water W110 stored in the storage unit 116 from the cooling tower 110 to the cooled device 131, and a sprinkling unit of the cooling tower 110 that supplies the circulating water W110 from the cooled device 131. And a circulating water recovery line L112 for recovery to 112.

  The circulating water supply line L111 is a line that connects between the storage unit 116 of the cooling tower 110 and the apparatus to be cooled 131. The circulating water supply line L111 can supply the circulating water W110 stored in the storage unit 116 to the cooled device 131.

  A circulating water pump 132 is connected in the middle of the circulating water supply line L111. The circulating water pump 132 can send out the circulating water W110 from the upstream side to the downstream side of the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112). The circulating water pump 132 is electrically connected to the system controller 101. The operation (drive and stop) of the circulating water pump 132 is controlled by a drive signal from the system controller 101.

  An upstream end portion of the measurement line L113 is connected to the connection portion J112 of the circulating water supply line L111. A second temperature sensor 136 is connected to the connection portion J114 of the circulating water supply line L111. The second temperature sensor 136 is a temperature measuring device that measures the temperature of the circulating water W110 sent out from the storage unit 116 of the cooling tower 110 (hereinafter referred to as “exit temperature TP2”). The second temperature sensor 136 is electrically connected to the system control device 101. The outlet temperature TP2 of the circulating water W110 measured by the second temperature sensor 136 is transmitted to the system controller 101.

  The circulating water recovery line L112 is a line that connects between the cooled device 131 and the sprinkler 112 of the cooling tower 110. The circulating water recovery line L <b> 112 can recover the circulating water W <b> 110 heated by heat exchange in the apparatus to be cooled 131 to the sprinkler 112 of the cooling tower 110. The downstream side of the circulating water recovery line L112 is branched into a plurality of lines at the branch portion J111. The branched line is connected to each of the plurality of sprinklers 112.

  The first temperature sensor 135 is connected to the connection portion J115 of the circulating water recovery line L112. The first temperature sensor 135 is a temperature measuring device that measures the temperature of the circulating water W110 collected in the water sprinkling unit 112 of the cooling tower 110 (hereinafter referred to as “inlet temperature TP1”). The first temperature sensor 135 is electrically connected to the system control device 101. The inlet temperature TP1 of the circulating water W110 measured by the first temperature sensor 135 is transmitted to the system control apparatus 101.

  The apparatus to be cooled 131 is various devices such as a heat exchanger that needs to be cooled by the circulating water W110. The apparatus to be cooled 131 is, for example, a turbo chiller or an absorption chiller for various chemical plants, an air conditioner chiller for buildings, a cold water production machine or a vacuum chiller for food factories, and the like. The apparatus to be cooled 131 includes a circulating water flow path (not shown) inside.

  In the cooled device 131, the downstream end of the circulating water supply line L111 is connected to one end of the circulating water flow path. In the cooled device 131, the upstream end of the circulating water recovery line L112 is connected to the other end of the circulating water flow path. Therefore, the circulating water flow path, together with the circulating water supply line L111 and the circulating water recovery line L112, forms a circulation path for circulating the circulating water W110 between the tower body 111 of the cooling tower 110 and the cooled device 131.

  The electrical conductivity measuring device 133 is a device that measures the electrical conductivity of the circulating water W110. The electrical conductivity measuring device 133 is connected to the circulating water line L110 at the connection portion J112 via the measurement line L113. In addition, the electrical conductivity measuring device 133 is electrically connected to the system control device 101. The electrical conductivity measured by the electrical conductivity measuring device 133 is transmitted to the system control device 101 as a detection signal. The electrical conductivity measuring device 133 measures the electrical conductivity at a predetermined time interval (or real time) and transmits it to the system control device 101.

  The residual chlorine measuring device 134 is a chemical amount detection means for detecting the dissolved chemical amount of a chemical (chlorine slime control agent) described later by measuring the residual chlorine concentration in the circulating water W110, that is, the residual chlorine amount. As will be described later, in the water treatment system 100 of the present embodiment, the supply amount of the chemical is controlled based on the residual chlorine amount of the circulating water W110 measured by the residual chlorine measuring device 134.

  The residual chlorine measuring device 134 collects a part of the circulating water W110 from the measurement line L113, adds a color reagent to the collected circulating water W110, causes it to react, and measures the color intensity of the circulating water W110 by this reaction. Thus, the residual chlorine concentration of the circulating water W110 is measured. Such a residual chlorine measuring device 134 is described in, for example, Japanese Patent Application Laid-Open No. 2007-93398, and is already known.

  The residual chlorine measuring device 134 is connected to the circulating water line L110 at the connection portion J112 via the measurement line L113. Further, the residual chlorine measuring device 134 is electrically connected to the system control device 101. The residual chlorine amount measured by the residual chlorine measuring device 134 is transmitted to the system control device 101 as a detection signal. The residual chlorine measuring device 134 measures the residual chlorine amount at a predetermined time interval (or real time) and transmits it to the system control device 101.

  The medicine supply device 150 is a facility for supplying medicine to the circulating water W110 stored in the storage unit 116 of the cooling tower 110. The medicine supply device 150 includes a medicine tank 151 and a medicine supply pump 152 as a fixed discharge pump means.

  The chemical tank 151 is a container that stores a chlorine-based slime control agent as a chemical for improving the quality of the circulating water W110. The slime control agent is a drug for suppressing the growth of microorganisms such as fungi and algae in the circulating water W110. As the chlorine-based slime control agent, for example, sodium hypochlorite is used.

  The drug supply pump 152 is a facility that sends the drug stored in the drug tank 151 to the storage unit 116 of the cooling tower 110 via the drug supply line L130. As the medicine supply pump 152, a fixed discharge pump such as a diaphragm pump, a plunger pump, or a bellows pump can be used.

  The drug supply pump 152 can supply a drug intermittently to a drug supply line L130 (described later) by reciprocating a valve body such as a diaphragm by an electromagnetic driving force.

  The medicine supply pump 152 sets the discharge amount per shot (mL / shot) to a predetermined value and increases / decreases the number of discharges per unit time (number of shots / minute), thereby increasing the discharge amount of medicine (mL / min). ) Can be controlled. The number of discharges per unit time (hereinafter simply referred to as “discharge number”) can be set stepwise from the minimum discharge number Smin to the maximum discharge number Smax. The number of shots refers to the number of times the valve body reciprocates. One reciprocation of the valve body corresponds to one shot.

  The drug supply pump 152 is connected to the storage unit 116 of the cooling tower 110 via the drug supply line L130. The medicine stored in the medicine tank 151 is sent out to the storage section 116 of the cooling tower 110 via the medicine supply line L130.

  The medicine supply pump 152 is electrically connected to the system control device 101. The operation (drive and stop) of the medicine supply pump 152 is controlled by a drive signal transmitted from the system control apparatus 101. As will be described later, the system control apparatus 101 outputs a drive signal corresponding to the set number of discharges (number of shots / minute) to the medicine supply pump 152. Based on this drive signal, the discharge amount (mL / min) of the medicine in the medicine supply pump 152 is controlled.

  On the other hand, a makeup water line L120 is connected to the cooling tower 110. The makeup water line L120 is a line for replenishing the makeup water W121 to the storage section 116 of the cooling tower 110. The upstream side of the makeup water line L120 is a first makeup water line L121 connected to a supply source (not shown) of raw water W120 such as tap water or industrial water. On the other hand, the downstream side of the makeup water line L120 branches to the second makeup water line L122 and the third makeup water line L123 at the connecting portion J121. In the first makeup water line L121, a raw water pump 141 and a raw water valve 142 are provided in order from the upstream side.

  The raw water pump 141 can send the raw water W120 from the upstream side to the downstream side of the makeup water line L120. The raw water pump 141 is electrically connected to the system control device 101. The operation (drive and stop) of the raw water pump 141 is controlled by a drive signal from the system controller 101.

  The raw water valve 142 can open and close the makeup water line L120 on the discharge side of the raw water pump 141. The raw water valve 142 is electrically connected to the system controller 101 (not shown). The opening and closing of the valve body in the raw water valve 142 is controlled by a drive signal from the system control device 101.

  The downstream end of the second makeup water line L122 is connected to the tower body 111 of the cooling tower 110. A makeup water valve 143 is provided in the middle of the second makeup water line L122. The makeup water valve 143 is a water supply facility that forcibly supplies the makeup water W121 to the storage section 116 by opening and closing the second makeup water line L122. The makeup water valve 143 is electrically connected to the system control device 101. The opening and closing of the valve body in the makeup water valve 143 is controlled by a drive signal from the system control device 101.

  The downstream end of the third makeup water line L123 is connected to the tower main body 111 of the cooling tower 110. A water faucet 144 is provided at the downstream end of the third makeup water line L123. The water tap 144 is a ball tap type water supply facility that manages the water level (that is, the amount of water) of the circulating water W <b> 110 stored in the storage unit 116. When the water level of the circulating water W110 stored in the storage unit 116 decreases in the water tap 144, the ball tap operates and the supply water W121 flowing through the third supply water line L123 is supplied to the storage unit 116.

  The drain line L140 is connected to the bottom of the storage part 116 and extends downward. The drainage line L140 is a line for forcibly discharging the circulating water W110 stored in the storage unit 116 of the cooling tower 110 to the outside of the water treatment system 100 in the first and second blow processes described later. A drain valve 145 is provided in the middle of the drain line L140. The drain valve 145 can open and close the drain line L140. The drain valve 145 is electrically connected to the system controller 101. The opening and closing of the valve body in the drain valve 145 is controlled by a drive signal from the system control device 101.

  The cooling tower 110 is connected to an overflow line L150 in addition to the above-described circulating water line L110, makeup water line L120, chemical supply line L130, and drainage line L140. The overflow line L150 discharges the circulating water W110 overflowing from the storage part 116 of the cooling tower 110 to the outside of the water treatment system 100 when the makeup water valve 143 is opened and the makeup water W121 is forcibly supplied. Line. That is, the overflow line L150 is stored in the storage unit 116 of the cooling tower 110 by controlling the opening and closing of the replenishing water valve 143 instead of the opening and closing control of the drain valve 145 in the first and second blow processes described later. It functions as a line for forcibly discharging the circulating water W110 out of the water treatment system 100.

  Next, with reference to FIG. 2, the function which concerns on control of the water treatment system 100 of this embodiment is demonstrated. FIG. 2 is a functional block diagram relating to control of the water treatment system 100 of the present embodiment.

  The system control apparatus 101 controls the operation of each unit in the water treatment system 100 of the present embodiment. As shown in FIG. 2, the system control apparatus 101 is electrically connected to, for example, the fan drive unit 122, the circulating water pump 132, the raw water pump 141, the makeup water valve 143, the drain valve 145, and the medicine supply pump 152.

  The system control device 101 is electrically connected to each measurement device of the water treatment system 100 and receives measurement information from these measurement devices. For example, the system control device 101 is electrically connected to the electrical conductivity measuring device 133, and receives the electrical conductivity EC of the circulating water W110 measured by the electrical conductivity measuring device 133 as a detection signal. The system controller 101 is electrically connected to the residual chlorine measuring device 134 and receives the residual chlorine amount C of the circulating water W110 measured by the residual chlorine measuring device 134 as a detection signal.

  The system control apparatus 101 is electrically connected to the first temperature sensor 135 and the second temperature sensor 136. The system control apparatus 101 receives the inlet temperature TP1 of the circulating water W110 measured by the first temperature sensor 135 and the outlet temperature TP2 of the circulating water W110 measured by the second temperature sensor 136 as detection signals.

  In the system controller 101, the received electrical conductivity EC, residual chlorine amount C, inlet temperature TP1 and outlet temperature TP2 of the circulating water W110 are stored in the memory 103 (described later). Further, the electrical conductivity EC, the residual chlorine amount C, the inlet temperature TP1 and the outlet temperature TP2 are sequentially updated to the latest values at predetermined time intervals (or real time). Among these, for the electrical conductivity EC, a value (EC1) when the time measurement in a third time zone T3 to be described later is started and a value (EC2) when the time measurement is finished are held in the memory 103.

  The system control apparatus 101 includes a control unit 102 and a memory 103. In addition to the function of controlling the entire water treatment system 100, the control unit 102 is a means for executing a medicine supply process and a blow process, which will be described later. The enrichment determination unit 163 and the blow processing control unit 164 are provided. In the control unit 102, the function of controlling the entire water treatment system 100 and the function of the time measuring unit 161, the medicine supply control unit 162, the concentration determination unit 163, and the blow processing control unit 164 are a microprocessor including a CPU and an internal memory ( (Not shown). Hereinafter, functions of the time measuring unit 161, the medicine supply control unit 162, the concentration determination unit 163, and the blow processing control unit 164 will be described.

  The timer 161 measures the first time zone T1, the second time zone T2, and the third time zone T3 in a blow process described later. The first time zone T1 is a waiting time when observing a change in the electrical conductivity EC. The second time zone T2 is the execution time of the blow process. The third time zone T3 is a standby time during which the blow process is not performed.

  When the residual chlorine amount C detected by the residual chlorine measuring device 134 exceeds the first residual chlorine amount C1, which is the lower limit threshold value of the residual chlorine amount that increases the number of times of discharge of the chemical, the chemical supply control unit 162 The discharge number S of the medicine supplied from the supply pump 152 is set to the maximum discharge number Smax (100%). Then, the medicine supply control unit 162 transmits a drive signal corresponding to the set maximum number of discharges Smax to the medicine supply pump 152. Thereby, the medicine supply pump 152 supplies the medicine to the circulating water W110 with a discharge amount corresponding to the maximum number of discharges Smax.

  In addition, the chemical supply control unit 162 determines that the residual chlorine amount C detected by the residual chlorine measuring device 134 is a second residual chlorine whose upper limit threshold value is the first residual chlorine amount C1 and the residual chlorine amount that decreases the number of times the medicine is discharged. When the intermediate value of the amount C2 (> C1) is exceeded, the number of discharges S of the medicine supplied from the medicine supply pump 152 is set to an intermediate discharge number Smid (50) which is intermediate between the maximum discharge number Smax and the minimum discharge number Smin. %). Then, the medicine supply control unit 162 transmits a drive signal corresponding to the set intermediate discharge frequency Smid to the medicine supply pump 152. Thereby, the medicine supply pump 152 supplies the medicine to the circulating water W110 with a discharge amount corresponding to the intermediate discharge number Smid.

  The intermediate value between the first residual chlorine amount C1 and the second residual chlorine amount C2 is the intermediate value (50%) between the first residual chlorine amount C1 and the second residual chlorine amount C2 as in this embodiment. Alternatively, it may be a substantially intermediate value (for example, 45% to 55%) set in a predetermined range on the plus side and the minus side on the basis of this intermediate value.

  In addition, when the residual chlorine amount C detected by the residual chlorine measuring device 134 is equal to or greater than the second residual chlorine amount C2, the medicine supply control unit 162 discharges the number S of discharges of the medicine supplied from the medicine supply pump 152. Set to the number of times Szero (0%). Then, the medicine supply control unit 162 transmits a drive signal corresponding to the set number of ejection times Szero to the medicine supply pump 152. Thereby, the medicine supply pump 152 stops the supply of the medicine to the circulating water W110.

  The concentration determination unit 163 determines whether or not the electrical conductivity EC measured by the electrical conductivity measuring device 133 is equal to or greater than a predetermined threshold value. As the predetermined threshold, for example, an upper limit electric conductivity that can prevent the occurrence of obstacles such as scale adhesion and corrosion in the cooled apparatus 131 due to an increase in the concentration of the circulating water W110 is set.

  The blow process control unit 164 performs the first blow process and the second blow process based on the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 of the circulating water W110 in the cooling tower 110 and the determination result of the concentration determination unit 163. Control switching. The first blow process is a normal blow process. The second blow process is a blow process for backup when a failure or the like occurs in the electrical conductivity measuring device 133. These blow processes will be described later.

  The memory 103 stores a control program and various data necessary for controlling the water treatment system 100. Specifically, in the memory 103, a control program for operating various functions necessary for controlling the water treatment system 100, the electrical conductivity EC measured by the electrical conductivity measuring device 133, and the residual chlorine measuring device 134 are measured. The residual chlorine amount C, various threshold values, various calculated values, and the like are stored in predetermined storage areas assigned thereto.

  Next, in the water treatment system 100 of the present embodiment, an operation when supplying a drug from the drug supply apparatus 150 to the storage unit 116 of the cooling tower 110 will be described with reference to FIG. FIG. 3 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 controls the supply of the medicine from the medicine supply device 150 to the circulating water line L110. The control in the flowchart shown in FIG. 3 is executed by the control unit 102 based on a control program stored in the memory 103. 3 is repeatedly executed during operation of the water treatment system 100.

As shown in FIG. 3, in step ST <b> 101, the medicine supply control unit 162 acquires the residual chlorine amount C of the circulating water W <b> 110 detected by the residual chlorine measuring device 134.
In step ST102, the medicine supply control unit 162 determines whether or not the obtained residual chlorine amount C is equal to or less than a first residual chlorine amount C1 that is a lower limit threshold value of the residual chlorine amount that increases the number of times the medicine is discharged. In step ST102, when the chemical supply control unit 162 determines that the residual chlorine amount C ≦ the first residual chlorine amount C1 (YES), the process proceeds to step ST103. In step ST102, when the chemical supply control unit 162 determines that the residual chlorine amount C> the first residual chlorine amount C1 (NO), the process of this flowchart ends (returns to step ST101).

In step ST103 (step ST102: YES determination), the medicine supply control unit 162 sets the number of discharges S of the medicine supply pump 152 to the maximum number of discharges Smax (100%).
In step ST104, the medicine supply control unit 162 drives the medicine supply pump 152 with the set maximum number of discharges Smax. As a result, the medicine is supplied from the medicine supply pump 152 to the storage section 116 of the cooling tower 110 with the maximum discharge amount.

In step ST105, the chemical supply control unit 162 acquires the residual chlorine amount C of the circulating water W110 detected by the residual chlorine measuring device 134.
In step ST106, the chemical supply control unit 162 determines whether or not the acquired residual chlorine amount C is equal to or greater than an intermediate value between the first residual chlorine amount C1 and the second residual chlorine amount C2. In step ST106, when the chemical supply control unit 162 determines that the residual chlorine amount C is equal to or greater than the intermediate value between the first residual chlorine amount C1 and the second residual chlorine amount C2 (YES), the process is step. Move on to ST107. In step ST106, when the chemical supply control unit 162 determines that the residual chlorine amount C is less than the intermediate value between the first residual chlorine amount C1 and the second residual chlorine amount C2 (NO), the process is performed. The process returns to step ST104 (continues the medicine supply with the maximum discharge amount).

In step ST107 (step ST106: YES determination), the medicine supply control unit 162 sets the number of discharges S of the medicine supply pump 152 to the intermediate number of discharges Smid (50%).
In step ST108, the medicine supply control unit 162 drives the medicine supply pump 152 with the set intermediate discharge number Smid. Thereby, the medicine is supplied from the medicine supply pump 152 to the storage unit 116 of the cooling tower 110 with an intermediate discharge amount between the maximum discharge amount and the minimum discharge amount.

In step ST109, the medicine supply control unit 162 acquires the residual chlorine amount C of the circulating water W110 detected by the residual chlorine measuring device 134.
In step ST110, the medicine supply control unit 162 determines whether the acquired residual chlorine amount C is equal to or greater than the second residual chlorine amount C2. In step ST110, when the chemical supply control unit 162 determines that the residual chlorine amount C ≧ the second residual chlorine amount C2 (YES), the process proceeds to step ST111. In step ST110, when the chemical supply control unit 162 determines that the residual chlorine amount C <the second residual chlorine amount C2 (NO), the process returns to step ST108 (the chemical supply at the intermediate discharge amount). Continue).

  In step ST111 (step ST110: YES determination), the medicine supply control unit 162 sets the number of discharges S of the medicine supply pump 152 to the number of discharges Szero (0%). Thereby, the driving | operation of the chemical | medical agent supply pump 152 stops. The stop of the medicine supply pump 152 is continued until the residual chlorine amount C again becomes equal to or less than the first residual chlorine amount C1 (that is, until YES is determined in step ST101).

  Next, in the water treatment system 100 of this embodiment, the operation | movement in the case of performing the blow process of the circulating water W110 is demonstrated. First, an outline of the blow process will be described.

  A part of the circulating water W110 evaporates when it is cooled by the cooling tower 110. During the operation of the water treatment system 100, the cooling tower 110 repeats evaporation of the circulating water W110. For this reason, the concentration of the circulating water W110 gradually increases. When the concentration of the circulating water W110 increases, the concentration of impurities such as corrosive ions and scale generation factors contained in the circulating water W110 also increases. When the degree of concentration of the circulating water W110 becomes higher than a predetermined threshold value, there is a high possibility that obstacles such as scale adhesion and corrosion will occur in the cooled apparatus 131.

  In order to prevent this, it is necessary to constantly monitor the concentration of the circulating water W110 during operation of the water treatment system 100. Normally, the electrical conductivity increases as the concentration of the circulating water W110 increases. Therefore, the concentration of the circulating water W110 can be indirectly determined by periodically measuring the electrical conductivity EC of the circulating water W110. When the concentration determination unit 163 determines that the electrical conductivity EC measured by the electrical conductivity measuring device 133 is greater than or equal to a predetermined threshold value, the blow processing control unit 164 performs a later-described blow process.

In the blow process, drainage and replenishment of the circulating water W110 are performed simultaneously or continuously. When draining the circulating water W110, it is performed by one of the following methods.
(Forced drainage blow)
The blow processing control unit 164 opens the drain valve 145 and discharges a part of the circulating water W110 stored in the storage unit 116 of the cooling tower 110 from the drain line L140 to the outside. When a part of the circulating water W110 is discharged, the water level of the storage unit 116 is lowered, so that the ball tap of the water tap 144 is operated, and new makeup water W121 is replenished through the third makeup water line L123. When this forced drainage blow is performed, the replenishing water valve 143 remains in the closed state and no opening / closing operation is performed.

(Forced rehydration blow)
The blow process control unit 165 opens the makeup water valve 143 and forcibly replenishes the storage section 116 with new makeup water W121 through the second makeup water line L122. When the makeup water W121 is replenished, the water level in the storage unit 116 rises, so that the overflowing circulating water W110 is discharged from the overflow line L150 to the outside. In addition, when implementing this forced water replenishment blow, the drain valve 145 remains in a closed state, and no opening / closing operation is performed.

  The makeup water W121 that is newly replenished during the blow processing has a lower electrical conductivity than the concentrated circulation water W110, so that the electrical conductivity of the circulation water W110 can be lowered as a whole. The blow process is a normal blow process that is periodically performed during operation of the water treatment system 100. In the present embodiment, this blow process is referred to as “first blow process”.

  On the other hand, when a failure such as a failure occurs in the electrical conductivity measuring device 133 (or when a disconnection occurs with the system control device 101), the correct electrical conductivity EC is not detected and the detected value Is always zero or a fixed value. In such a case, since the blow process is not performed even though the concentration of the circulating water W110 is high, there is a possibility that a malfunction occurs in the cooled apparatus 131.

  Therefore, in the water treatment system 100 of the present embodiment, the electrical conductivity EC measured by the electrical conductivity measuring device 133 under the condition that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 of the circulating water W110 is a predetermined value or more. Is not changed by more than a predetermined value, it is determined that a failure such as a failure has occurred in the electrical conductivity measuring device 133, and intermittent blow processing is performed while the circulating water pump 132 is in operation. I have to. Such a blow process is a backup blow process performed when a failure such as a failure occurs in the electrical conductivity measuring device 133. In the present embodiment, this blow process is referred to as “second blow process”.

  Hereinafter, the operation when the circulating process of the circulating water W110 is performed will be described with reference to FIGS. FIG. 4 is a flowchart showing an overall processing procedure when the control unit 102 of the water treatment system 100 executes the blow processing. FIG. 5 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 executes the first blow process. FIG. 6 is a flowchart illustrating a processing procedure when the control unit 102 of the water treatment system 100 executes the second blow process.

  First, an overall processing procedure when the control unit 102 of the water treatment system 100 executes a blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 4 is repeatedly executed during the operation of the water treatment system 100.

  In step ST201, the blow process control unit 164 determines whether the circulating water pump 132 is in operation and the blow process is stopped. The blow processing control unit 164 determines that the blow processing is stopped when both the makeup water valve 143 and the drain valve 145 are closed, and when either the makeup water valve 143 or the drain valve 145 is open. Determines that the blow process is being executed. In step ST201, when the blow process control unit 164 determines that the circulating water pump 132 is in operation and the blow process is stopped (YES), the process proceeds to step ST202. In Step ST201, when the blow process control unit 164 determines that the circulating water pump 132 is in operation and the blow process is not stopped (NO), the process returns to Step ST201 again.

  In step ST202 (step ST201: YES determination), the blow processing control unit 164 acquires the inlet temperature TP1 of the circulating water W110 from the first temperature sensor 135 and the outlet temperature TP2 of the circulating water W110 from the second temperature sensor 136. .

  In step ST203, the blow process control unit 164 determines whether the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value. In step ST203, when the blow process control unit 164 determines that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value (YES), the process proceeds to step ST204. In step ST203, if the blow process control unit 164 determines that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is less than a predetermined value (NO), the process returns to step ST201 again.

  As described above, when the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value, it is considered that the circulating water W110 has evaporated and the degree of concentration is high. Move to the step to do. On the other hand, when the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is less than a predetermined value, the concentration of the circulating water W110 is considered to be relatively low, and thus the process does not proceed to the step of determining the execution of the blow process. In addition, it waits until it reaches a state where the enrichment is considered to be high.

In step ST204 (step ST203: YES determination), the blow process control unit 164 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC1.
In step ST205, the blow processing control unit 164 causes the time measuring unit 161 to start measuring the third time zone T3.

  In step ST206, the blow process control unit 164 determines whether or not the time measuring unit 161 has finished measuring the third time period T3. In step ST206, when the blow process control unit 164 determines that the time measurement in the third time zone T3 has ended (YES), the process proceeds to step ST207. If the blow process control unit 164 determines in step ST206 that the time measurement in the third time period T3 has not ended (NO), the process returns to step ST206.

  In step ST207 (step ST206: YES determination), the blow process control unit 164 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC2.

  In step ST208, the blow process control unit 164 determines whether or not the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value (EC2−EC1 ≧ predetermined value). In step ST208, when the blow process control unit 164 determines that the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value (YES), the process proceeds to step ST209. In step ST208, when the blow process control unit 164 determines that the difference between the electrical conductivities EC1 and EC2 is less than a predetermined value (NO), the process proceeds to step ST210.

  Thus, if the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value, it is considered that the electrical conductivity measuring device 133 is operating normally reflecting the progress of concentration of the circulating water W110. The process proceeds to a step for executing a normal blow process. On the other hand, if the difference between the electrical conductivities EC1 and EC2 is less than a predetermined value, a malfunction such as a failure occurs in the electrical conductivity measuring device 133. For example, the detected value is always zero or a fixed value. Therefore, the process proceeds to the step of executing the blow process for backup.

  In step ST209 (step ST208: YES determination), the blow process control unit 164 executes a first blow process to be described later. On the other hand, in step ST210 (step ST208: NO determination), the blow process control unit 164 executes a second blow process described later.

  Next, a processing procedure when the control unit 102 of the water treatment system 100 executes the first blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 5 is executed as a subroutine in step ST209 of FIG.

In step ST301, the blow process control unit 164 determines whether or not the circulating water pump 132 is in operation. In step ST301, when the blow process control unit 164 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST302. In step ST301, when the blow process control unit 164 determines that the circulating water pump 132 is not operating (NO), the process of this flowchart ends (returns to step ST201).
In step ST302 (step ST301: YES determination), the blow process control unit 164 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC3.

  In step ST303, the blow process control unit 164 compares the electrical conductivity EC3 with the electrical conductivity ECth1 that is an upper limit threshold value for starting the blow process, and determines whether or not the electrical conductivity EC3 is equal to or higher than the electrical conductivity ECth1. . If the blow process control unit 164 determines in step ST303 that the electrical conductivity EC3 is equal to or higher than the electrical conductivity ECth1 (YES), the process proceeds to step ST304. In step ST303, when the blow process control unit 164 determines that the electrical conductivity EC3 is less than the electrical conductivity ECth1 (NO), the process of this flowchart ends (returns to step ST201).

In step ST304 (step ST303: YES determination), the blow processing control unit 164 starts blow processing (drainage and replenishment of the circulating water W110).
In step ST305, the blow process control unit 164 determines whether or not the circulating water pump 132 is in operation. In step ST305, when the blow process control unit 164 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST306. In Step ST305, when the blow processing control unit 164 determines that the circulating water pump 132 is not operating (NO), the process proceeds to Step ST308.

When the operation of the circulating water pump 132 is stopped, the circulating water W110 does not circulate. For this reason, when operation of circulating water pump 132 stops after starting blow processing, it shifts to Step ST108 and ends blow processing.
In step ST306 (step ST305: YES determination), the blow process control unit 164 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC4.

  In step ST307, the blow process control unit 164 compares the electrical conductivity EC4 with the electrical conductivity ECth2, which is a lower limit threshold value for ending the blow process, and determines whether or not the electrical conductivity EC4 is less than the electrical conductivity ECth2. . In step ST307, if the blow process control unit 164 determines that the electrical conductivity EC4 is less than the electrical conductivity ECth2 (YES), the process proceeds to step ST308. If the blow process control unit 164 determines in step ST307 that the electrical conductivity EC4 is equal to or higher than the electrical conductivity ECth2 (NO), the process returns to step ST304.

  Thus, when the electrical conductivity EC4 acquired after the start of the blow process is less than the electrical conductivity ECth2, it is considered that the concentration of the circulating water W110 has become sufficiently low, and the process proceeds to the step of ending the blow process. To do. On the other hand, when the electrical conductivity EC4 is equal to or higher than the electrical conductivity ECth2, it is considered that the concentration of the circulating water W110 is still high. Therefore, the process proceeds to the step of continuing the blowing process.

  In step ST308 (step ST305: NO determination or step ST307: YES determination), the blow process control unit 164 ends the blow process. Thereby, the process of this flowchart is complete | finished (it returns to step ST201).

  Next, a processing procedure when the control unit 102 of the water treatment system 100 executes the second blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 6 is executed as a subroutine in step ST210 of FIG.

  In step ST401, the blow process control unit 164 determines whether or not the circulating water pump 132 is in operation. In step ST401, when the blow process control unit 164 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST402. In step ST401, if the blow process control unit 164 determines that the circulating water pump 132 is not operating (NO), the process proceeds to step ST405.

In step ST402 (step ST401: YES determination), the blow processing control unit 164 starts blow processing (drainage and replenishment of the circulating water W110).
In step ST403, the blow process control part 164 starts the time measurement of the 4th time slot | zone T4 by the time measuring part 161. FIG.

  In step ST404, the blow process control unit 164 determines whether or not the time measurement in the fourth time period T4 in the time measurement unit 161 has ended. In step ST404, when the blow process control unit 164 determines that the time measurement of the fourth time period T4 has ended (YES), the process proceeds to step ST406. If the blow process control unit 164 determines in step ST404 that the timing of the fourth time period T4 has not ended (NO), the process returns to step ST401.

  On the other hand, in step ST405 (step ST401: NO determination), the blow processing control unit 164 finishes the time measurement and blow processing of the fourth time period T4 by the time measuring unit 161, and then the processing of this flowchart ends (step ST201). Return).

As described above, when the operation of the circulating water pump 132 is stopped, the circulating water W110 does not circulate. For this reason, when operation of circulating water pump 132 stops after starting blow processing, it shifts to Step ST405 and ends time-measurement and blow processing of the 4th time zone T4.
In step ST406 (step ST404: YES determination), the blow process control unit 164 ends the blow process.

  In step ST407, the blow process control unit 164 determines whether or not the circulating water pump 132 is in operation. In step ST407, when the blow process control unit 164 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST408. In step ST407, if the blow process control unit 164 determines that the circulating water pump 132 is not operating (NO), the process proceeds to step ST410.

In step ST408 (step ST407: YES determination), the blow process control unit 164 causes the time measuring unit 161 to start measuring the fifth time zone T5.
In step ST409, the blow process control unit 164 determines whether or not the time measurement in the fifth time zone T5 in the time measurement unit 161 has ended. In step ST409, when the blow process control unit 164 determines that the time measurement in the fifth time period T5 has ended (YES), the process returns to step ST401. If the blow process control unit 164 determines in step ST409 that the time measurement of the fifth time period T5 has not ended (NO), the process returns to step ST406.

  In step ST410 (step ST407: NO determination), the blow process control unit 164 ends the time measurement in the fifth time zone T5 by the time measuring unit 161, and the process of this flowchart ends (returns to step ST201).

  In the second blow process for backup described above, the blow process is executed in the fourth time zone T4. In addition, in the fifth time period T5, execution of the blow process is stopped. Thus, in the second blow process, the blow process is intermittently performed until the operation of the circulating water pump 132 is stopped.

According to the water treatment system 100 of this embodiment mentioned above, there exist the following effects, for example.
In the water treatment system 100 of the present embodiment, the amount of residual chlorine contained in the circulating water W110 is less than the first residual chlorine amount C1, the middle between the first residual chlorine amount C1 and the second residual chlorine amount C2, and the second residual chlorine. The medicine supply control unit 162 is provided that determines whether the amount is the chlorine amount C2 or more and sets the number of discharges (supply amount) of the medicine supply pump according to the determination result.

  Therefore, before the amount of residual chlorine detected from the circulating water W110 becomes equal to or greater than the upper limit threshold for reducing the number of discharges, the amount of chemical supplied to the circulating water W110 can be appropriately controlled. Therefore, a timer chemical injection method in which the supply and stop of the chemical to the circulating water W110 are alternately repeated every predetermined time, or a method in which the chemical is continuously supplied until the residual chlorine amount detected from the circulating water W110 exceeds a predetermined value. In comparison, an excessive supply of the drug can be suppressed. As a result, the drug concentration in the circulating water W110 can be maintained in an appropriate range.

  Further, in the water treatment system 100 of the present embodiment, a fixed amount discharge pump is used as the medicine supply pump 152. For this reason, the supply amount of the medicine can be quantitatively controlled as the number of ejections per unit time (shot number / minute).

  Further, in the water treatment system 100 of the present embodiment, the blow treatment control unit 164 has a difference between the inlet temperature TP1 and the outlet temperature TP2 in the cooling tower 110 of the circulating water W110 equal to or greater than a predetermined value, and in the third time zone T3. When it is determined that the difference between the electrical conductivities EC1 and EC2 before and after is less than a predetermined value, a second blow process for backup is performed.

  Therefore, even when a failure such as a failure occurs in the electrical conductivity measuring device 133 and the detected electrical conductivity EC is always zero or a fixed value, the blow process can be surely performed. Therefore, the highly concentrated circulating water W110 is supplied to the cooled device 131, and it is possible to suppress the occurrence of failures such as scale adhesion and corrosion in the cooled device 131.

As mentioned above, although preferred embodiment of this invention was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above.
In the present embodiment, the example in which the number S of medicine ejections is set in three stages of Szero (0%), Smid (50%), and Smax (100%) has been described. However, the number of ejections is not limited to this, and the number of ejections may be set more finely, such as 0%, 25%, 50%, 75%, and 100%. Further, the number of discharges of the chemical supply pump 152 is set so that the intermediate value between the first residual chlorine amount C1 and the second residual chlorine amount C2 is a target value, and the residual chlorine amount detected from the circulating water W110 becomes this target value. S may be PI controlled (continuous operation).

  In this embodiment, the example using the residual chlorine measuring device 134 which measures the residual chlorine amount of the circulating water W110 was demonstrated as a chemical | medical agent amount detection means in the case of using a chlorine-type slime control agent as a chemical | medical agent. Not limited to this, the medicine amount detection means is appropriately selected according to the medicine supplied to the circulating water W110. For example, when using a non-chlorine-based slime control agent (for example, an oxygen-based oxidant such as hydrogen peroxide) as a chemical, the redox potential of the circulating water W110 is measured with a redox potential measuring device. Thus, the amount of drug can be indirectly detected.

  In addition, when using a non-oxidized type slime control agent, anticorrosive agent, scale inhibitor, etc., the amount of the drug is indirectly detected by measuring the concentration of the tracer substance mixed with the drug in the circulating water W110. can do. As the tracer substance, for example, a lithium salt such as lithium chloride, a fluorescent compound such as pyrenesulfonic acid, a dye having absorption at a specific wavelength, and the like can be used. Examples of the drug amount detection means for detecting these tracer substances include an ion electrode type lithium ion concentration measurement device, a fluorescence intensity measurement device, and a transmitted light intensity measurement device.

  In addition, various well-known substances can be used for the slime control agent, anticorrosive agent, and scale inhibitor other than an oxidation type. Examples of slime control agents other than the oxidized type include isothiazoline compounds and carbamate compounds. Examples of the anticorrosive include silicate, zinc salt, molybdenum salt, benzotriazole derivative and the like. Furthermore, examples of the scale inhibitor include carboxylic acid polymers, acrylic acid polymers, phosphonic acid chelating agents, carboxylic acid chelating agents, and the like.

  In this embodiment, the example which supplies a chemical | medical agent from the chemical | medical agent supply apparatus 150 to the storage part 116 of the cooling tower 110 was demonstrated. However, the present invention is not limited to this, and the medicine may be directly supplied to the circulating water line L110. That is, if the drug can be finally supplied to the circulating water line L110, the positions where the drug is supplied are the cooling tower 110 (watering part 112, storage part 116) and the circulating water line L110 (circulating water supply line L111, circulation). Any of the water recovery lines L112) may be used.

In the present embodiment, when the second blow process is executed, the administrator of the water treatment system 100 may be notified by an alarm or the like that a failure such as a failure has occurred in the electrical conductivity measuring device 133. .
In this embodiment, although the example which comprised the cooling tower 110 as an open type cooling tower was shown, it does not restrict to this and you may comprise the cooling tower 110 as a closed type cooling tower.

DESCRIPTION OF SYMBOLS 100 Water treatment system 101 System control apparatus 102 Control part 103 Memory 110 Cooling tower 112 Sprinkling part 116 Storage part 131 Cooled apparatus 132 Circulating water pump 133 Electrical conductivity measuring apparatus 134 Residual chlorine measuring apparatus (drug amount detection means)
135 1st temperature sensor 136 2nd temperature sensor 150 chemical | medical agent supply apparatus 161 time measuring part 162 chemical | medical agent supply control part (medicine supply control means)
163 Concentration determination unit 164 Blow processing control unit L110 Circulating water line L111 Circulating water supply line L112 Circulating water recovery line L120 Makeup water line L130 Drug supply line L140 Drain line W110 Circulating water W121 Makeup water

Claims (2)

A cooling tower for cooling the circulating water supplied to the apparatus to be cooled;
A circulating water line for circulating circulating water between the cooling tower and the cooled device;
A metering discharge pump means for supplying the medicine to the circulating water line based on a set number of discharges per unit time;
A drug amount detecting means for detecting the amount of a drug contained in the circulating water flowing through the circulating water line as a dissolved drug amount;
(I) When the amount of the dissolved drug detected by the drug amount detection means is lower than the first dissolved drug amount that is the lower limit threshold value of the dissolved drug amount that increases the number of discharges per unit time of the drug, the quantitative discharge A process of setting the number of discharges per unit time of the medicine supplied from the pump means to the maximum number of discharges and supplying the medicine from the metering discharge pump means to the circulating water line by the set number of discharges; (ii) the medicine When the amount of the dissolved drug detected by the amount detection means exceeds the first dissolved drug amount and falls below the second dissolved drug amount which is the upper limit threshold of the dissolved drug amount that reduces the number of times the drug is discharged per unit time, The number of discharges per unit time of the medicine supplied from the fixed discharge pump means is set to a number smaller than the maximum number of discharges and larger than the minimum number of discharges, and the set discharge A process for supplying a drug from the fixed amount discharge pump means to the circulating water line according to the number; and (iii) when the dissolved drug amount detected by the drug amount detecting means exceeds a second dissolved drug amount, A medicine supply control means for executing a process of stopping the supply of the medicine by the pump means;
A water treatment system comprising.   The medicine supply control means is supplied from the metering discharge pump means when the amount of the dissolved medicine detected by the medicine amount detection means exceeds a substantially intermediate value between the first dissolved medicine amount and the second dissolved medicine amount. The number of discharges per unit time of the drug to be set is set to a number approximately halfway between the maximum number of discharges and the minimum number of discharges, and the drug is supplied from the metering discharge pump means to the circulating water line by the set number of discharges. Item 2. A water treatment system according to item 1.

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